Blueberry jam is a sweet, fruity spread made by cooking fresh or frozen blueberries with sugar, lemon juice, and pectin to help it thicken. The blueberries break down during cooking, releasing their juices and creating a rich, deep purple preserve with a balance of sweetness and tartness.
 
Homemade blueberry jam has a chunky texture with bursts of whole or partially crushed berries. It’s perfect on toast, bagels, pancakes, or yogurt, and can even be used as a filling for pastries or cakes.